Fluid metering process and apparatus



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FLUID METERING PROCESS AND APPARATUS Filed Jan. 15, 1962 8 Sheets-Sheet4 INVENTOR. GERALD C. MAYER ArroR/wss Sept. 21, 1965 G. c. MAYER FLUIDMETERING PROCESS AND APPARATUS 8 Sheets-Sheet 5 Filed Jan. 15, 1962INVENTOR. @zmw C. MA YER Sept. 21, 1965 G. c. MAYER FLUID METERINGPROCESS AND APPARATUS 8 Sheets-Sheet 6 Filed Jan. 15, 1962 INVENTORzwALo C Mrs? M wmwv Sept. 21, 1965 G. c. MAYER 3,206,977

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FLUID METERING PROCESS AND APPARATUS Filed Jan. 15, 1962 8 Sheets-Sheet8 559 INVENTOR.

GERALD C. MA YER M 4- Kai/mam AT IEYS United States Patent 3,206,977FLUID METERING PROCESS AND APPARATUS Gerald C. Mayer, Wayne, N.J.,assignor to The Richardson Scale Co., Clifton, N.J., a corporation ofNew Jersey Filed Jan. 15, 1962, Ser. No. 166,181 32 Claims. (CL 73-224)This invention relates to a process and apparatus for metering a body ofmatter composed of two principal ingredients and determining the volumecontent referred to a standard condition of each ingredient.

This application is a continuation-in-part of my copending applicationfiled November 16, 1960 and bearing the Serial Number 69,768 nowabandoned.

A particular application of interest is in the oil industry. Forexample, a pipeline company normally purchases oil from an oil fieldproducer on the basis of a standard specific gravity referred to aspecific temperature. The oil pumped from the wells is contaminated bywater, and is subject to ambient temperature fluctuations. The problemin such purchases resides in determining the standard volume of an oilin the mixture transferred to the pipeline company to be used as thebasis for payment.

Various measuring methods and systems are presently employed primarilyfor determining the oil content of a wells production as a basis forroyalty payment and/ or for oil well testing as required by certainStates, but all systems known to be in use either are only approximateat best, or involve the use of auxiliary equipment to separate the oiland Water into two separate streams before metering, and/or removesamples of the fluid and based on an analysis of the samples, make anestimate of the quantity of oil.

The present invention provdes, for the first time, accurate meteringwithout the need for such auxiliary equipment, and in addition providesautomatically without need for additional manual computation volumefigures of all the fluid, and of all the oil in the fluid referred tothe standard temperature condition. Further, it is capable of continuousunattended operation which results in relatively inexpensivemeasurements, particularly over long periods.

Accordingly, it is a primary object of the present invention to providea metering apparatus, particularly a fluid metering apparatus which willdetermine the amount, referred to the conditions desired, of a certainingredient substance in a combination of substances, such as a fluidmixture.

Another object of the present invention is to provide an apparatusmentioned in the preceding paragraph which will operate continuouslywithout manual control or manipulations.

Another object of the present invention is to provide an accuratemetering apparatus for measuring the amount of a certain ingredient in amixed fluid, and which also measures the total amount of fluid flowingthrough a line.

A further object of the present invention is to provide an apparatus formetering a body of matter comprised of a combination of substanceshaving a weight determining device and temperature compensatingmechanism for transmitting a force proportional to the amount of acertain ingredient in the body of matter to a register section forindicating the amount of the ingredient referred to a certaintemperature.

Another object of the present invention is to provide a method andapparatus for metering all of the amount of an ingredient in a fluid andalso metering the entire amount of fluid without the necessity ofremoving the fluid from the system in which it is flowing.

ice

Still another object of the present invention is to provide an accuratemetering apparatus which will determine the amount of a selectedingredient in a body of metered fluid containing a plurality ofingredients and which will provide a manifestation of the amountcorrected to a standard temperature for the ingredient.

A further object of the present invention resides in the provision of ametering apparatus as set forth in the preceding object in which asimplified unitary counterweighted scale beam is employed to compare thedifference in weights produced by the presence of the selectedingredient in the body of fluid and to modify a resultant unbalancedforce produced by such a comparison for providing the manifestation ofthe amount of the selected ingredient at a standarized temperature.

Still another object of the present invention resides in the provisionof a novel apparatus for determining the volume of a selected one of aplurality of ingredients contained in a fluid body of predeterminedvolume in which the fluid body is disposed in container suspended from acounterweighted scale beam.

Another object of the present invention resides on the provision of anovel apparatus as set forth in the preceding apparatus in which asingle valve is employed to fill the container and to facilitatedischarge of the fluid therefrom.

A further object of the present invention resides in the provision of anovel apparatus for determining the volume of a selected one of aplurality of ingredients contained in a fluid body confined in acontainer of predetermined volume in which an automatic system isemployed to cyclically fill and empty the container with successivebatches of the fluid with the rate of discharge of each fluid body fromthe container being increased by application of a pressurized fluidduring the discharge cycle.

Other objects and advantages will become apparent from the appendedclaims and the following description and accompanying drawing wherein:

FIGURE 1 is a diagrammatic illustration of the metering system accordingto one embodiment of the present invention;

FIGURE 2 is a diagrammatic force diagram of the resolver leverillustrated in FIGURE 1 with explanatory equations;

FIGURE 3 is an enlarged detailed perspective view of the resolver leverillustrated in FIGURE 1;

FIGURE 4 is a top plan view illustrating a metering apparatus accordingto a further embodiment of the present invention in which the scale andresolver beams 3f FIGURES 1-3 are combined into a unitary scale eam;

FIGURE 5 is a front elevational view of the metering apparatus asillustrated in FIGURE 4;

FIGURE 6 is a right-hand elevational view of the metering apparatusillustrated in FIGURE 4 with certain components thereof partially brokenaway to illustrate details of the apparatus;

FIGURE 7 is a section taken substantially along lines 77 of FIGURE 5;

FIGURE 8 is a section taken substantially along lines 8-8 of FIGURE 5;

FIGURE 8A is an enlarged fragmentary partially sectioned elevationalview of the left-hand hanger assembly illustrated in FIGURE 8 andpivotally suspending the apparatus scale beam;

FIGURE 8B is an enlarged fragmentary section taken substantially alonglines 8B-8B of FIGURE 8 and illustrating details of the hanger assemblyshown in FIG- URES 8 and 8A;

FIGURE 9 is a section taken substantially along lines 99 of FIGURE 4;

FIGURE 10 is a section taken substantially along lines 10-10 of FIGURE4;

FIGURE 11 is a schematic view of a modified automatic weighing systemembodying the apparatus as illustrated in FIGURES 4*10; and

FIGURE 12 is a further modified system embodying the apparatusillustrated in FIGURES 4-10.

' According to the invention in its preferred embodiment which will beexplained in connection with determining the amount of crude oil in afluid being extracted from a well, a specfic volume of the fiuid mixtureis weighed and has its temperature measured. These measurements are thenautomatically converted to record and/ or totalize the correspondingcrude oil content at the standard temperature. It will be understoodthat in accord with the present invention any body of matter composedprimarily of a combination of two substances can be measured whichcombinations may be two granular solids, a liquid solution, emulsion ormixture, and a liquid solid mixture for example.

In explanation of the principles of the operation first assume that aconstant volume V of the fluid mixture is weighed and that thetemperature of this mixture is measured and found to be t,,,. Asssumefurther that the mixture is composed primarily of water and oil, andthat the Weight per unit volume at the standard temperature of oil isknown and designated as b and that of the weight per unit volume of thewater is designated as a The specific weight a and b may beexperimentally determined by known methods and will remain substantiallyconstant for any particular lease or well. Once determined, they are setinto the metering system by adjustments as will hereinafter appear.v

According to the laws of thermal expansion the specific weights of theoil and water will vary with temperature in the following form:

To refer this volume X to the standard temperature, the laws of thermalexpansion can again be applied so:

Where X is the volume of oil in the original mixture referred back tostandard conditions.

Substituting values in the above equation yields:

an?) 1+K.om-t.) W 1 n tr a( m r) b( m r) Which can be reduced byeliminating second order affects which can be shown to be negligible to:

5;. If the metering is to be accomplished in standard units of volume V,then & V

will be the fractional portion of a unit to be recorded and/ ortotalized, and the equation becomes:

FIGURE 1 illustrates a system comprising a weighing device operablyinterconnected with a recording apparatus and providing a practicalsolution for accurately metering the entire fluid passed through thesystem, computing the content of ingredient b, at reference or standardconditions, recording and totalizing this result, and totalizing thetotal fluid output.

The total fluid flow is from the oil well or group of oil wells in afield, through conduit 1, through inlet control valve 2, and into thecalibrated constant volume metering tank 3 having volume V. Tank 3 isconnected to line 1 by a T-shaped connector 4 which is connected atopposite ends to flexible conduit couplings 7 and 8. After beingmetered, the fluid in tank 3 is discharged into the line and tank 3 isrefilled for metering the next portion of line fluid. Thus, it isapparent that all of the line fluid passes through the meteringapparatus as opposed to the taking of mere samples as in previousmeasuring systems.

To admit line fluid to tank 3 and initiate metering action by themetering system, the system ON-OFF valve 10 is placed in the ON positionas shown in FIG- URE l, with a 3-way control valve 5 in the positionshown. Inlet valve 2 is opened by the action of pneumatic motor 12operated thru control valve 10a by pressure from a pressure source 14::(indicated by an arrow in FIGURE 1) which may be a pump or any othersuitable source of pressure. This allows line fluid from conduit 1 toflow through valve 2 into tank 3. Metering tank outlet valve 16 is heldclosed by pneumatic motor 18 until energized by pressure from pressuresource 14a as will be explained.

Pneumatic motors 22a and 22b are positioned on opposite sides of valve5. They are small diaphragm motors with a latch for shifting valve 5Which is preferably the type shuttle valve manufactured by Garrett OilTools, Inc. of Longview, Texas and known as type E. When tank 3 holdsslightly less than standard volume V a high level switch 20 is actuatedby the fluid level acting on adjustable switch float 21 thereby applyingpressure to pneumatic motor 22a causing 3-way control valve 5 to shiftand close metering tank inlet valve 2 in response to pressure fromsource 14a acting oppositely on pneumatic motor 12 through line 23. Asvalve 2 is closed, tank 3 will contain V units of fluid volume having aweight of W pounds. The total volume V is calibrated after assembly ofthe systems of the present invention by adjusting the position of float21 so that the volume V includes the volume of both flexible couplings 7and 8, connectors 4, float chamber 21a about float 21, and of course,the volume of tank 3.

The metering tank 3 is part of a Weighting device supported by trunnions24 on knife edges or the like 26 on a main scale lever 28 fulcrumed at apoint 30 on a ground support member (not shown) intermediate its. ends.The lever ratio of scale lever 28 is preferably 1:1. An adjustablecounterweight 32 is held on main lever 28 at its end opposite tank 3 byknife edges 31 engaging support trunnions 33 on weight 32. Weight 32 isof suificient size as to provide a moment about fulcrum 30 equivalent tothat produced by a. volume V filled with water, i.e., a V.

A force transfer rod 34 is connected at one end to lever 28 over thecenter of gravity of weight by pivot mount 35 engaging knife edge 31a,which is in line with knife edges 31, but inverted with respect to them,and is connected at its other end by a pivot mount 38 on knife edge 40to a resolver lever 36 which is fulcrumed intermediate its ends at 42.

The force exerted on transfer rod 34 and therefore to knife edge 40 onlever 36 is equal to a V-W which is proportional to the amount ofingredient b in the measured fluid.

Resolver lever 36 is equipped with an automatic adjustment mechanismcomprised of a positioning cylinder 44 and pneumatic positioner 45 influid communication with cylinder 44 which compensates the system forchanges in specific gravity caused by deviations from standardtemperature of the fluid being measured by adjusting the position of alongitudinally movable rod 50 and position of a counterweight 51 securedthereto. Such compensations enable resolver lever 36 to convert theforce (a ,VW) exerted at knife edge 40 into a force directlyproportional to the amount of oil in volume V at standard temperatureand to apply the force to the recording section of the system, as willbe described, by transmitting it from the resolver lever force take-offtrunnion 52 (also mounted on rod 50) to force transfer rod 54.

The automatic adjustment mechanism is operated in response to a pressureinput proportional to temperature variations in the fluid being meteredfrom standard conditions received through line 46 from a temperaturetransmitter 48 which senses the temperature of fluid in tank 3 by asensor unit 49. Pneumatic positioner 45 is a device which iscommercially available from several manufacturers; however, aparticularly suit able one is the Vernier Valvactor manufactured by theFoxboro Company of Foxboro, Massachusetts, and described in FoxboroBulletin 5C02lA, April 1956, which bulletin is hereby incorporated byreference for a detailed description of the positioner. Temperaturecompensations are made by providing a longitudinally movable rod 50 toautomatically compensate for fluid temperature changes by proportionallypositioning counterweight 51 and varying the lever ratio of lever 36 asit is shifted longitudinally by the positioning mechanism. Suchadjustments compensate for the expansion of the fluid due to temperaturewhich cause a variation in specific gravity.

As shown in diagrammatic FGURE l a force takeoff trunnion 52 on resolverlever 36 is afiixed to movable rod 50' of automatic adjustment mechanism(44, 45) and has a vertical link 54 connected thereto. Movable rod 50 isconnected at one end to cylinder 44, and poistioner 45 is connected torod 50 by a mechanical link 4501. Rod 50 and weight 51 will belongitudinally displaced, powered by cylinder 44 whose positioningpressure is controlled through lines 45b illustrated in FIGURE 2 by thepneumatic positioner 45 in response to temperature changes of the fluidin tank 3 as transmitted thru line 46.

As is apparent from Equation 8 set out above, only the last terms on theright-hand side of the equation in both numerator and denominator areaffected by tem perature. The numerator indicates that the torque on theresolver should be decreased as temperature rises, while the denominatorcalls for a change in lever length. The torque is varied by adjustmentof weight 51 relative to fulcrum 42 whereas the lever length betweenfulcrum 42 and trunnion 52 is varied by longitudinal movement of rod 50.

For original system calibration assume that temperature sensor 49 isheld at the standard temperature t Referring now to FIGURE 2, whereinresolver lever 36 is diagrammatically illustrated, the distance fromresolver lever main fulcrum 42 to knife edge 40 is arbitrarilyestablished as L, and the distance from fulcrum 42 to force take-offtrunnion 52 is adjusted to be (a ,.b VL according to a calibrated scale(not shown) on lever 36 to which indicator arm 53 (shown in FIG- URE 3)on trunnion 52 extends. The scale may conveniently indicate units ofdifference between the specific gravities of the a and b liquids. Withthis adjustment established, the lever is balanced by counterweight 57(shown in FIGURE 3) whereby, when f zt and EZt -VZW, then F52 Xt ):0.

Next the automatic adjustment mechanism is calibrated so that movablerod 50, and elements aifixed thereto, will have their position vary withtemperature in the following relationship as illustrated in FIGURE 2.

The total Weight of the moving elements on resolver lever 36 includesthe cylinder piston, trunnion 52, rod 50 and link 54, and positioner arm45a. The size of weight 51 is selected so that the weight of thesemoving elements has a total effect equal to pounds (as indicated in FIG.2). As described above, longitudinal movement of rod 50 adjusts thelength of the lever arm between fulcrum 42 and 52, and also varies theposition of weight 51 about the fulcrum, thus varying the force outputof the resolver lever at trunnion 51 which is impauted to link 54. Thisshifting motion of rod 50 compensates the force proportional to theamount of ingredient b for temperature change in the fluid being meteredwhich is transmitted through link 54 to the register mechanism.

From the foregoing it will be apparent that once tank 3 has been filledand line 1 closed to fluid flow the weighing device including tank 3,scale lever 28, and counterweight 32 will effect a downward pull ontransfer rod 34 equal in amount to a comparison of the difference inweight between the fluid in tank 3 and the weight of a like amount ofwater at standard conditions. Such pull will unbalance resolver lever 36causing an upward force on trunnion 52, which produces an upward forceon vertical link 54 proportional to the volume of ingredient b in thefluid at standard temperature.

By positioning fulcrum 42 the effective lever arm between it and knifeedge 40 is constant whereas the effective lever arm between fulcrum 42and link 54 is regulated by the automatic adjustment mechanism (44, 45)operating on rod to which trunnion 52 is attached. Thus, in response totemperature the actual volume of ingredient b at standard temperature iscomputed to determine the force which will be transmitted from resolverlever 36 to the indicating and recording apparatus through link 54. Thisforce, proportional to the amount of ingredient h under standardizedconditions, is transmitted from resolver lever output trunnion 52 tovertical link 54 which is connected to a toothed rack 56. A pinion fixedto a rotatable indicator shaft 62 is meshed with rack 56 for rotatingshaft 62 in response to movements of rack 56 and link 54. A tensionspring 64 is attached to link 54 between the lower end of rack 56 andground support 66. This causes link 54 to assume a position directlyproportional to the force exerted at trunnion 52. A pointer 68 isattached to one end of indicator shaft 62 which when rotated by rack 56,causes the pointer to move over a graduated scale 70. At this point inthe operation of the preferred system of the present invention, theindicator will read at a number equivalent to the fractional content ofingredient b at standard temperature contained in the standard volume V.The spring constant of tension spring 64 is so selected, that theindicator shaft 62 will make one complete revolution (360) as the forcedeveloped at trunnion 52 varies from zero to maximum, i.e., when thefluid in tank 3 is all a to all P (see Fig. 2) =(t t )a VK r b (i.e.,all water to all oil for example).

As Qought out above, 3-way valve was shifted to the left from itsposition shown in FIGURE 1 to effect closure of tank inlet valve 2 aftervolume V had entered the measuring system. As valve 5 shifts, cylinderrod 78 of motor 80 is caused to travel downward at a slow rateadjustable by flow control valve 82. At the time cylinder rod 78 beginsits slow downward travel, lever 36 is in balance and indicator shaft 62is positioned in accord with the amount of oil in tank 3, which amountis indicated by pointer 68 on scale 70. The speed of cylinder rod 78 isto (1) allow the scale system to stabilize after accepting volume V, and(2) to allow sufficient time for engagement of clutch 83 to provide adriving interconnection between rotatable shaft 62 and totalizingcounter 85.

In its downward path, an arm 78a aflixed to rod 78 first actuates apneumatic limit switch 88 thereby engaging clutch 83. Spring 88:: onswitch 88 allows for overtravel of arm 78a. Next, arm 78a physicallydepresses resolver lever 36 to relieve the force exerted on spring 64permitting it to compress and rotate shaft 62 by pulling rack 56downward and totalizing counter 85, until the mechanical stop 86 isreached when the indicator 68 reads 0.

As rod 78 continues downward it actuates a ratchet counter 89 which isadvanced one unit each time a volume V is measured by the system, andthen actuates a second pneumatic limit switch 90. The latter causesswitch 88 to disengage clutch 83 by venting its pressure and connectspressure to pneumatic motor 18 opening valve 16 and permitting the fluidV in tank 3 to drain from the measuring system.

As the fluid is drained from tank 3, low level limit switch 92 locatedbelow outlet valve 16 in line 1 will have its float 94 displacedupwardly as chamber 95 is filled. The downward movement of switch 92vents pneumatic motor 22b resetting its latch. When chamber 95 drains,float 94 will fall due to gravity and restore switch 92 to its originalposition which thereby connects pressure through line 98 from source 96to reset motor 22b. This results in motor 22b resetting valve 5 in itsoriginal position, opening of valve 2, closing valve 16, and the cyclefor determining the amount of oil in the fluid in tank 3 is thenrepeated.

Referring now specifically to FIGURE 3, resolver lever 36 is shown indetail in its preferred form. The main body of the lever has twosubstantially parallel elongated body members 100, 104 spaced apart bysupporting cross plates 108, 112 at opposite ends thereof. Positioningcylinder 44 is mounted on plate 112 and pneumatic positioner 45 issecured in place by a vertically disposed mounting block 116 which issupported by plate 112 or otherwise suitably secured to body member 104.

Extending longitudinally along lever 36 is movable rod 50 which haspolished rod portions 120, 124 and a reduced end portion 130 which isthe piston rod of cylinder 44.

Rod 50 is supported approximately at fulcrum 42 (not shown) by a roller142 mounted on bracket 144, which roller engages polished rod section124 to permit longitudinal movement of rod 50 with minimum frictionresistance.

Polished rod section 120 at the other end of rod 50 is supported byrollers 150, 152 held in poistion by brackets 156, 158 secured to crosssupport plate 108.

Force take-off trunnion 52 is located intermediate polished rod sections124 and 150 on rod 50 and is fixed to pivoted force rod connector 160,which is adapted to be secured to vertical force transmitting link 54(not shown in FIGURE 3). The movable rod counterweight 51 is fixed tothe rod 50 by means of a set screw or any other suitable means.

Counterweight 57 utilized in the original calibration of the system isadjustably mounted on scale 180 on lever 36. Scale 180 has connectingrods 182 located substantially opposite knife edge 40 and fulcrum 42.

It is also contemplated to use measurements of the h ad in tank 3through pressure or differential pressure transducers in place of aweight measurement with forces exerted on a lever similar to thatpreviously described.

It is also contemplated to use the invention herein described with anytwo ingredient mixture, that is two granular solids, a liquid solution,emulsion, or mixture and a liquid solid mixture.

To avoid temperature compensations it is possible to design the meteringtank so that its volumetric capacity will decrease with temperature inthe proper ratio if changes in the ratios are over a narrow range.

FIGURES 411 illustrate another embodiment of the present invention inwhich the main scale lever 28 and revolver lever 36 of FIGURES 1-3 arecombined into a unitary scale beam 200 having three parallel spacedapart beam bars or members 202, 204 and 206. Beam bars 202, 204 and 206are each block shaped in cross section with bar 204 being disposedbetween bars 202 and 206 and nearer to bar 202. Bars 202 and 204 are ofthe same length and are rigidly joined together adjacent theircorresponding ends by parallel spaced apart cross pieces 208 and 210.Bar 206 is somewhat shorter than bars 202 and 204, and is rigidly joinedto bar 204 by means of parallel spaced apart tubular cross pieces 212and 214 extending at right angles to bars 204 and 206.

Cross piece 214 extends from the left-hand end of bar 206, as viewedfrom FIGURE 4, and is fixed to bar 204 intermediate to the ends thereof.Cross piece 212 is fixed to bars 204 and 206 inwardly of the right-handends thereof by approximately the same distance.

With continued reference to FIGURES 4-6, metering tank 3 andcounterweight 32 are suspended from scale beam 200 in a manner to bepresently described with scale beam 200 being fulcrumed in a rigid frame218. Frame 218 is generally of box-like shape and is made up of uprightcorner structural beam members 219 together with a s ries ofhorizontally disposed transverse and longitudinal members 220. A pair ofground engaging channel like runners 221 at the base of frame 218 enablethe frame to he slid along a support surface.

As will presently become apparent, scale beam 200, metering tank 3 andcounterweight 32 may be fixedly clamped in place on frame 218 tofacilitate ready transportation of the assembly from one location toanother without causing damage by movement of the component parts of thescale mechanism.

In carrying out the foregoing object of the present invention and withcontinued reference to FIGURES 4-6 and 8, scale beam 200 is suspendedfrom frame 218 by means of a pair of parallel spaced apart uprightmounting screws 222 and 224 (FIGURE 8). Each of the mounting screws 222and 224 threadedly extends through a collar 226 fixedly secured by anysuitable means to a top transverse structural beam member 227 of frame218. Secured to the upper end of each of the screws 222 and 224 is ahandwheel 228 which is mounted on its respective collar 226. Lock nuts230 threaded onto the upper ends of mounting screws 222 and 224 abovehandwheels 228 may be tightened to retain handwheels 228 in place.

Mounting screws 222 and 224 respectively terminate vertically above beambars 204 and 206 and carry hanger support nuts 232 and 234 at theirlower ends. Respectively suspended from nuts 232 and 234 are beamsupport hangers 236 and 238 which carry scale beam 200. Each of thehangers 236 and 238 are of inverted U-shaped having parallel spacedapart upstanding arms 240 and 242 (FIGURE 8A) extending one on each sideof its respective beam bar (204, 206) and rigidly joined by a crosspiece 243 through which respective ones of the mounting screws 222 and224 freely extend. As best shown in FIGURES 8A and 8B, each of the arms240 and 242 is of frame like form having a rectangularly shaped aperture244 and carrying a notched pivot seat block 245 fixedly seated at thelower end of aperture 244.

Hanger 236 engages oppositely facing aligned knife edges 246 and 248(FIGURE 8A) fixed to beam bar 204 inwardly of cross piece 212. Knifeedges 246 and 248 respectively extend through apertures 244 of hanger236 and are seated on the upwardly directed notched surfaces of pivotblocks 245, as best shown in FIGURE 8B. Similarly, hanger 238 engagesoppositely facing aligned knife edges 250 and 252 fixed to beam bar 206in alignment with knife edges 246 and 248 and along an axis extending inparallel relation to crosspiece 212. Knife edges 250 and 252respectively extend through apertures 244 of hanger 238 and are seatedon the upwardly directed notched surfaces of blocks 245 carried byhanger 238.

With the structure thus far described, it will be appreciated that scalebeam '200 is suspended from hangers 236 and 238 and may be bodily raisedand lowered by manipulation of handwheels 228 to advance screws 222 and224 in either direction. During operation, scale beam 200 is pivotallysuspended from hangers 236 and 238 to a fulcrum about an axis extendingthrough knife edges 246, 248, 250 and 252.

-In order to secure scale beam 200 against movement during transit ofthe assembly from one location to another, a pair of cradles 256 and 258are fixedly secured to frame 218 vertically beneath cross pieces 212 and214 respectively as best shown in FIGURES 9 and 10. Cradles 256 and 258are respectively provided with upwardly facing V-shaped notches 260 and262 formed in spaced apart cradle plate sections extending in parallelrelation to beam bars 204 and 206 and indicated at 263. The apexes ofnotches 260 and 262 respectively align with the centers of cross pieces212 and 214 and receive cross pieces 212 and 214 when scale beam 200 islowered by manipulation of handwheels 228. Cradles 258 and 256 aredisposed approximately midway between the ends of cross pieces 212 and214 to support scale beam 200 when the scale beam is lowered into itsrest position.

In order to lock scale beam 200 in its resting position on cradles 256and 258 and to thereby prevent movement thereof, a pair of clampingscrews 264 and 266 are respectively threadedly carried by brackets 268and 270 which are fixedly secured to the frame 218 as best shown inFIGURES 9 and 10. Clamping screw 264 is threaded through bracket 268along a vertical axis passing through the center of cross piece 212 whenthe latter is seated in notch 260 and has an enlarged head 272 facingcross piece 212. When cross piece 212 is resting in cradle 256, clampingscrew 264 is advanced downwardly to abuttingly engage head 272 withcross piece 212 to thereby clamp cross piece 212 between head 272 andcradle 256. Screw 264 is locked in place by means of a locking nut andwasher assembly 274 mounted on the upper end of screw 264 on the side ofbracket 268 facing away from head 272.

Similarly, clamping screw 266 is threaded upwardly through bracket 272along a vertical axis passing through the center of cross piece 214 whenthe latter is seated in notch 262 and has an enlarged head 276 at itslower end facing cross piece 214. With cross piece 214 resting on cradle258, clamping screw 266 is advanced downwardly to abuttingly engage head276 with cross piece 214 thereby clamping cross piece 214 between head276 and cradle 258. Clamping screw 266 is locked in place by means of anut and washer assembly 278 mounted on screw 266 on side of bracket 270facing away from head 276.

During the operation of the assembly, mounting screws 222 and 224 areadvanced upwardly to raise scale beam 200 to its weighing position wherecross pieces 212 and 214 are in spaced relation above cradles 256 and258 with clamping screws 264 and 266 backed out to be in spaced relationabove cross pieces 212 and 214. In this weighing position, scale beam200 is free to fulcrum about its knife edges 246, 248, 250 and 252. Tosecure scale beam 200 against movement, handwheels 228 are manipulatedto advance screws 222 and 224 downwardly to lower scale beam 200sufficiently until it rests on cradles 256 and 258. By advancing screws222 and 224 by a further distance, hangers 236 and 238 are loweredsufficiently to separate seats 245 from knife edges 246, 248, 250 and252 thereby allowing cradles 256 and 258 to be the sole support forscale beam 200. With scale beam 200 resting on cradles 256 and 258,clamping screws 264 and 266 are advanced downwardly to abut heads 272and 276 with cross pieces 212 and 214 and thereby lockingly clamp scalebeam 200 against movement.

With reference now to FIGURES 4, 5 and 7, metering tank 3 is suspendedfrom scale beam 200 by means of a pair of hangers 282 and 284 eachhaving a pair of upstanding arms 286 and 288 extending one on each sideof their respective beam bar (204, 206). Each arm 286 and 288 isprovided with a frame-like form having a rectangularly shaped opening289 (FIGURE 5).

Received in each opening 289 at the upper end thereof is a pivot seatblock 290 (FIGURE 5) having a downwardly facing notched knife edgeengaging surface and being fixedly secured to the respective hanger arm(286, 288).

As best shown in FIGURES 5 and 7, arms 286 and 288 of hanger 282 arepivotally secured in sideby-side relationship to an upstanding ear 292rigidly fixed to metering tank 3. Similarly, arms 286 and 288 of hanger284 are pivotally secured in side by-side relationship to an 'upstandingear 294 rigidly fixed to metering tank 3. Engaging the notched seatingsurfaces of the pivot seats 290 in hanger 282 are aligned knife edgesindicated at 296 and fixed to beam bar 204 on oppositely facing sidesthereof along an axis extending parallel to the fulcrum axis of scalebeam 200. Similarly, the notched knife edge seating surfaces of pivotseats 290 in hanger 284 engage aligned knife edges indicated at 298 andfixed to beam bar 206 on opposite facing sides thereof along a commonaxis with knife edges 296. Knife edges 296 and 298 are fixed to beambars 204 and 206 respectively between the fulcrum of scale beam 200 andthe left-hand ends of bars 204 and 206 to provide a predetermined leverlength between the knife edge axis from which metering tank 3 issuspended and the fulcrum axis of scale beam 200.

Knife edges 296 and 298 extend freely through the openings 289 inhangers 282 and 284 respectively with openings 289 being of sufficientlength to allow knife edges 296 and 298 to be separated from their pivotseats 290.

In order to secure metering tank 3 against movement during transit ofthe metering apparatus, preferably three brackets indicated at 302 (twoshown) are fixed to frame 86 vertically beneath metering tank 3 as bestshown in FIGURES 5 and 6. Brackets 302 are equiangularly spaced apartabout the longitudinal axis of metering tank 3 and each has anupstanding section 304 formed with an inwardly directed flat face andapertured to receive bolts 306 of a bolt and nut assembly indicated at308 in FIGURE 5. The fiat inwardly directed surfaces of the bracketsections 304 closely face flat surfaces of downwardly extending ears 310rigidly fixed to the bottom side of metering tank 3 and extendingdownwardly beyond the top edge of bracket sections 304.

Ears 310 are provided with apertures which register with the aperturesformed in bracket sections 304 when metering tank 3 is locatedapproximately in its weighing position.

With metering tank 3 positioned to align the apertures in ears 310 andbracket sections 304, bolts 306 are mounted in place as shown, extendingthrough bracket sections 304 and ears 310 to fixedly secure meteringtank 3 to brackets 302. When scale beam 200 is lowered from its weighingposition with tank 3 fixed in place, knife edges 296 and 298 areseparated from their respective pivot seats 290.

With reference now to FIGURES 4, 5 and 6, counter weight 32 is suspendedfrom scale beam 200 by means of a pair of hanger assemblies 314 and 316carried by beam bars 204 and 206 respectively. Each of the hangerassemblies 314 and 316 comprises an upstanding threaded rod 318extending through a horizontally extending arm 320 fixed to counterweight 32. A nut 322 threaded on the lower end of rod 318 extendingbeyond arm 320 abuttingly supports arm 320 with counter weight 32suspended between hanger assemblies 314 and 316. The upper end of eachrod 318 extends through a cross piece 321 of a U-shaped hanger member322 and is supported therefrom by a nut 322a. Hanger member 322 isformed with spaced parallel upstanding arms 323 and 324 rigidly joinedby cross piece 321 and extending upwardly one on each side of itsrespective beam bar (204, 206). Arms 323 and 324 are formed with alignedrectangular openings indicated at 326 in FIGURE 5 and receiving pivotseats 330. Each pivot seat has a downwardly facing notched seatingsurface and is fixedly secured to its respective hanger arm by anysuitable means. Pivot seats 330 carried by hanger assembly 314 engagealigned knife edges indicated at 332 and fixed to beam bar 304 onopposite sides thereof adjacent to the right-hand end of bar 204 (asviewed from FIGURE 5) and to the right of the scale beam fulcrum axis.Similarly, pivot seats 330 carried by hanger assembly 316 engage a pairof aligned knife edges indicated at 334 in FIGURE 6 and fixedly securedto beam bar 206 in alignment with knife edges 332.

In order to secure counter weight 32 against movement when the meteringapparatus is in transit, a counter weight support 340 is provided forand comprises four rigid angle iron posts 342 fixed to frame 218 at thecorners of counter weight 32, the casing of which is rectangular incross section. Fixed to posts 342 are a pair of spaced apart horizontalmembers 346 (FIGURE 6) extending transversely of scale beam 200 andproviding an upwardly directed fiat horizontal seating surface 348 forcounter weight 32. Posts 342, which are made from angle iron, extendupwardly beyond seating surface 348 with their mutually perpendicularplate portions closely facing corresponding mutually perpendicular sidewall surfaces of counter weight 32 to provide a cradling guide channelfor counter weight 32.

By lowering scale beam 200 from its weighing position, counter weight 32is also lowered until it engages its support seat 348. With furtherlowering movement of scale beam 200, knife edges 332 and 334 aredisengaged from their respective pivot seats 330, thus allowing counterweight 32 to be supported solely by support 340. In seated position onsupport 340, counter weight 32 is abuttingly clamped in place betweenlocking screws 350 threaded through posts 342 above seat 348 on eachside of the counter weight.

Thus, with the foregoing structure it is evident that the meteringapparatus is quickly and easily prepared for transportation from onelocation to another simply by turning handwheels 228 to lower scale beam200 to its rest position on cradles 256 and 258 and by securing meteringtank 3 to brackets 302 in the manner previously described. In the courseof lowering scale beam 200, counter weight 32 will seat on support 340and is secured in place by screws 350. After counter weight 32 is seatedand metering tank 3 is fixedly secured to brackets 302 by nut and boltassemblies 308, further downward displacement of scale beam 200 bymanipulation of handwheels 228 will relieve knife edges 296, 298, 342and 344 in the manner previously described. The arrangement of parts issuch that disengagement of these knife edges with their respective pivotseats will occur before cross pieces 212 and 214 abuttingly engagecradles 256 and 258. After scale beam 200 is lowered sufliciently toseat on cradle 256 and 258, further advancement of screws 222 and 224 bymanipulation of handwheels 228 relieves knife edges 246, 248, 250 and252.

Scale beam 200 then is clamped in place by turning clamping screws 264and 266 inwardly until their respective heads 272 and 276 abuttinglyengage cross pieces 212 and 214 respectively to secure scale beam 200 inits seated position on cradles 256 and 258. By now removing the pipeconnections to metering tank 3, the assembly is prepared for transportwith all of the components of the apparatus including scale beam 200,metering tank 3 and counter weight 32 fixedly secured in position.

With continued reference to FIGURES 4 and 5, positioning cylinder 44,described in the embodiment of FIG- URES 1-3, is fixedly secured to agenerally U shaped bracket 356 having arm portions 358 and 360 bentrearwardly along the sides of positioning cylinder 44 and secured tobeam bars 202 and 204 respectively. Positioning cylinder 44 is disposedbetween arm portions 358 and 360 of mounting bracket 356 and betweenbeam bars 202 and 204 to the right of the fulcrum axis of scale beam 200as viewed from FIGURES 4 and 5. The longitudinal axis of cylinder 44extends in parallel relation to beam bars 202 and 204. Rod 50 is alignedwith the axis of positioning cylinder 44 and extends from positioningcylinder 44 toward the left-hand end of scale beam 200, terminating nearthe left-hand end of beam bars 202 and 204 which as previously mentionedare somewhat longer than beam bar 206. Rod 50 is supported on scale beam200 by means of a pair of rollers 364 and 366 which respectively engagethe polished cylindrical portions 124 and previously described. Roller364 is journalled on a cross piece 368 about an axis extending at rightangles between beam bars 202 and 204. Cross piece 368 is fixed at itsopposite ends to beam bars 202 and 204 between the pivot axis ofmetering tank 3 and the fulcrum axis of scale beam 200.

Roller 366 is journalled on cross piece 208 which as previouslydescribed is secured to beam bars 202 and 204 adjacent to theirleft-hand ends as viewed from FIGURES 4 and 5.

The force take-off trunnion 52 is located intermediate polished rodsections 124 and and is pivotally secured to rod connector to which thevertical force transmitting link 54 is fixed in the manner previouslydescribed in the embodiment of FIGURES 1-3. The movable rod counterweight 51 is also fixed to rod 50 in the same manner as previouslydescribed. Thus, it is clear that with trunnion 52 together with link 54disposed on the opposite side of the scale beam fulcrum axis fromcounter weight 32, rod 50 exerts a force which is transmitted to link 54and which opposes the moment established by counter weight 32. Theopposing moment produced by rod 50 is varied by adjustment of itseffective lever arm length under the control of positioner 45.

When metering tank 3 is at least partially filled with a fluid otherthan water, an unbalancing force is exerted on link 54 which isproportional to the amount of ingredient b (the oil) in the measured oilwell fluid as previously described. This force is modified by themovement of rod 50 which is regulated by the positioning cylinder 44under the control of positioner 45 in the manner previously described.The effective lever arm length between the scale beam fulcrum axis ofscale beam 200 and the pivot axis of link 54 is regulated by positioningcylinder 44 under the control of positioner 45 in the manner previouslydescribed to vary the moment of force opposing the moment of forceestablished by counter weight 32. Thus, a manifestation of the oilvolume (ingredient B) corrected to standard temperature (60 F.) isprovided for.

In order to maintain link 54 plum, the components of the recordingapparatus including rack 56, pinion 60, pointer 68 and dial 70, shaft62, clutch 83, totalizing counter 85 and counter 89 and weight spring 64are all mounted in a casing 372 having a back plate 374 on which theforegoing components are mounted. Rigidly extending outwardly from thelower end of back plate 374, are a pair of horizontally spaced apartparallel guide rail members 376 and 378 (FIGURE forming a horizontalchannel through which a horizontal guide rail 380 slidably extends.Guide rail 380 is fixed to frame 218. Thus, horizontal displacement ofrod 50 during operation causes casing 372 together with the componentparts mounted therein to slide horizontally along rail 380 to maintainlink 54 plum.

A dash pot 379 (FIGURE 5) of conventional form is operatively connectedto beam bar 202 in the manner shown to stabilize scale beam 200.

With reference now to FIGURE 11, a modified sys tem for automaticallyrefilling metering tank 3 is illustrated and comprises a gas separator390 to which fluid to be metered is delivered through an inlet pipe 392.Separator 390 may be of any conventional form of separating gas andliquid phases and have a liquid outlet connected to a bottom fill anddischarge port 394 of metering tank 3 by means of a conduit 396. Conduit396 is provided with a flexible pipe section 398 adjacent to meteringtank port 394 to permit movement of metering tank 3 with scale beam 200.

Passage of fluid from separator 390 to metering tank 3 is controlled bya three-position center closed metering valve 400. Metering valve 400comprises a ported valve member 402 shiftable disposed in a housing 404and rigidly connected to an operating stern 406. Operating stem 406extends beyond housing 404 and is fixedly secured to a diaphragm 408 ina valve operator 410. Valve operator 410 is provided with two enclosedchambers 412 and 414 separated by diaphragm 408 such that introductionof pressurized fluid into chamber 412 displaces valve member 402 in onedirection and introduction of pressurized fluid into chamber 414displaces valve member 402 in the opposite direction.

Valve 400 is provided with a supply port 415, a discharge port 416 andan operating port 418. By introducing pressurized fluid into chamber414, valve member 402 is positioned to establish fluid communicationbetween ports 415 and 418 for admitting fluid to be measured to meteringtank 3. By introducing pressurized fluid into chamber 412, valve member402 is positioned to establish fluid communication between ports 416 and418 for discharging fluid from metering tank 3 through a dischargeconduit 420. In its intermediate centered posi tion, valve member 402interrupts fluid communication between separator 390 and metering tank 3and also between discharge conduit 420 and metering tank 3, thusprecluding introduction and discharge of fluid with respect to meteringtank 3.

With the foregoing arrangement, all of the fluid delivered fromseparator 390 must pass through metering tank 3 before it is dischargedthrough conduit 420. Con duit 420 is connected to a float mechanismchamber 422 having an outlet connected to suitable apparatus forprocessing the metered fluid such as an oil treater.

With continued reference to FIGURE 11, metering valve 400 is under thecontrol of a shuttle valve 426 which is essentially of the sameconstruction as valve 5 described in the embodiment of FIGURES 1-3. Asshown, shuttle valve 426 comprises a housing 428 in which shuttle valvemember 430 is shiftably disposed. Fixedly joined to opposite ends ofshuttle valve member 430 are operating valve stems 432 and 434 whichextend in opposite directions beyond housing 428 and which arerespectively connected to diaphragms 436 and 438 of pneumatic valveoperators 440 and 442. Valve operator 440 is provided with a pressureoperating chamber 444 delimited by diaphragm 36 and valve operator 442is provided with a pressure operating chamber 448 delimited by diaphragm448.

Shuttle valve 426 is provided with a supply port 449, an exhaust port450 and two distinct operating ports 451 and 452. When pressurized fluidis introduced into chamher 448 to shift shuttle valve member 430 to theposition shown in FIGURE 11, fluid communication is established betweenports 449 and 451, and also between ports 450 and 452. When pressurizedfluid is admitted to chamber 444 to shift shuttle valve member 430downwardly, as viewed from FIGURE 11, fluid communication is establishedbetween ports 449 and 452 and also between ports 450 and 451.

Supply port 449 is connected by means of a conduit 453 to a fluidpressure source 454 as indicated by the arrow. Operating port 452 isconnected to chamber 414 of metering valve 400 by means of a conduit456. Disposed in conduit 456 between chamber 414 and operating port 452is a manually operable on-otf valve 458. Actuation of valve 458 to itson position allows fluid to flow from operating port 452 through conduit456 to chamber 414. By positioning valve 458 in its oil position, fluidflow through conduit 456 is interrupted.

With continued reference to FIGURE 11, a conventional float 462 isdisposed in float chamber 422 and is connected to a valve stem 464 to acontrol valve 466 which controls flow of pressurized fluid to chamber448. Valve 466 is disposed in a conduit 468 connected at one end tochamber 448 and intersecting conduit 453 at its other end. Operatingstem 464 is connected to a ported valve member 470 shiftably disposed ina housing 472 having a supply port 474, an exhaust port 475 and anoperating port 476. Ports 474 and 476 are connected to conduit 468 influid communication with supply source 454 and chamber 448 respectively.

When metered fluid in float chamber 422 is drained, float 462 is loweredto displace valve member 470 to a position where fluid communication isestablished between ports 474 and 476, thus admitting pressure fluid tochamber 448 for displacing shuttle valve member 430 to the positionshown in FIGURE 11. As fluid enters float chamber 422 during the removalof fluid from metering tank 3, float 462 is raised to shift valve member470 to a position where fluid communication is established between ports475 and 476 to vent pressurized fluid in chamber 448 in preparation forresetting shuttle valve 426 in a manner to be presently explained.

Pressurized fluid is introduced and discharged with respect to valveoperating chamber 444 through a conduit 480 connected at one end forfluid communication with chamber 444. The other end of conduit 480intersects conduit 468 between supply port 474 of valve 466 and supplysource 454.

Flow of pressurized fluid through conduit 480 is controlled by athree-way valve 482 having a ported valve member 484 shiftably receivedin a housing 485 and rigidly connected to a valve operating stem 486.Valve 482 is provided with a supply port 488 connected to conduit 480 influid communication with source 454, an operating port 489 connected toconduit 480 in fluid communication with valve operating chamber 444 andan exhaust port 490.

Operating stem 486 is connected to an upper level control float 494disposed in a float chamber 496. Depression of float 494 by drainingfluid from chamber 496 shifts valve member 484 to a position where fluidcommunication is established between ports 489 and 490 to vent fluid inchamber 444. When float 494 is raised by introducing fluid into chamber496, valve member 486 is shifted to a position where fluid communicationis established between ports 488 and 489 to supply pressurized fluid tochamber 444 from pressure source 454.

Float chamber 496 has a top port 497 connected to separator 390 by meansof a vent conduit 498 and a bottom port 499 connected to top opening 500in metering tank 3 as by a conduit 501. Conduit 501 is provided with aflexible conduit section 501a immediately adjacent to metering tank 3 toallow movement of metering tank 3 with scale beam 200.

Controlling fluid flow through conduit 501 is twoposition seal valve 502having a valve member 504 shiftably disposed in a valve casing 506. Avalve operating stem 508 rigidly connected to valve member 504 is secured to a diaphragm 510 of a valve operator 512.

Valve operator 512 is provided with a valve operating pressure chamber514 which is delimited by diaphragm 510 and which is in fluidcommunication with shuttle valve operating port 451 through conduit 456.When pressure is applied to diaphragm 510 in chamber 514, valve member504 is shifted to a position where valve 502 is opened to establishfluid communication between the interior of metering tank 3 and floatchamber 496 with float chamber 496 being continuous fluid communicationwith separator 390 through its top venting port 497. When pressurizedfluid in valve operating chamber 514 is vented, valve member 504 isshifted to its closed position, thus interrupting fluid flow between thebottom port 499 of float chamber 496 and metering tank 3.

With the structure thus far described, it is apparent that seal valve502 will be open during the time in which metering valve 400 is open toadmit fluid into metering tank 3 from gas separator 390. With seal valve502 open, the fluid introduced through valve 400 will raise to fillmetering tank 3, conduit 501 and the portion of conduit 396 betweenvalve 400 and metering tank 3. As the fluid level raises into chamber496 upon further introduction of fluid through metering tank port 394,float 494 is raised to displace valve member 484 of valve 482 to itsposition where fluid communication is established between pressuresource 454 and valve operating chamber 444, thus applying pressure todiaphragm 436 for shifting shuttle valve member 430 downwardly from theposition shown in FIGURE 11. When valve 400 is in its center closedposition, as established by venting both valve operating chambers 412and 414, or in its position for allowing fluid in metering tank 3, sealvalve 502 will be closed.

With continuing reference to FIGURE 11, operating port 452 of shuttlevalve 426 is connected to a conduit 524 for controlling flow ofpressurized fluid to chamber 412 of valve 400. Disposed in conduit 524between chamber 412 and port 452 is a hold-run valve 526. With valve 526in run position, the metering sequence of filling and discharging fluidwith respect to metering tank 3 will be automatically repeated. Withvalve in its hold position, weighing cycle will be stopped until valve526 is returned to its run position. 9

Controlling flow of fluid between shuttle valve operating port 452 andvalve operating chamber 412 is a fourway pilot valve 530 having a valvemember 532 shiftably disposed in a housing 533 and rigidly connected toa value operating stem 534. Pilot valve 530, being of the con ventionalfour-way type, is provided with a supply port 535, an exhaust port 536and two distinct operating ports 537 and 538. Supply port 535 isconnected to conduit 524 by means of a conduit 539 for fluidcommunication with shuttle valve operating port 452 through valve 526.Operating port 538 is connected to valve operating chamber 412 by meansof a conduit 540.

With continued reference to FIGURE 11, valve stem 534 is secured to aspring biased diaphragm 542 of a valve operator 544 having a pressureoperating chamber 546 delimited by diaphragm 542. By introducingpressurized fluid into chamber 546, valve member 532 is shifted to oneposition where fluid communication is established between operating port537 and exhaust port 536. In this position of pilot valve 530, fluidcommunication also is established between supply port 535 and operatingport 538 to furnish pressurized fluid to valve operating chamber 412 of,metering valve 400. When fluid in chamber 546 is vented, valve member532 is shifted to the position illustrated in FIGURE 11 where supplyport 535 is connected to operating port 537 and exhaust port 536 isconnected to operating port 538 to vent fluid in valve operating chamber412.

Operating port 537 of pilot valve 530 is connected by means of a conduit552 to an inlet port 554 of a zero limit switch valve 556 which is thesame as valve 90 described in the embodiment of FIGURES 1-3. Valve 556comprises a valve member 560 shiftably disposed in a housing 562 andrigidly connected to an operating stem 564 which extends beyond housing562 and which is rigidly connected to a piston 566 of the pneumaticmotor described in the embodiment of FIGURES 1-3. Motor 80 is providedwith a rigidly fixed cylinder 570 in which piston 566 is slidablydisposed. Valve 556 is provided with an operating port 571 connected toan expansible operating chamber 572 of clutch unit 83.

With continued reference to FIGURE 11, valve member 560 is biased bymeans of a spring 582 engaging piston 556 to a position where port 554connects to port 571 to establish fluid communication between operatingport 537 of pilot valve 530 and chamber 572.

Clutch 83 comprises a movable clutch member 584 slidably disposed inchamber 572 and engageable with a fixed clutch member 586 byintroduction of pressurized fluid into chamber 572. In the same manneras described in the embodiment of FIGURES 1-3, clutch member 586 ismounted on shaft 62 which carries pinion 60 meshing with rack 56, withrack 56 being fixed to the lower end of motion transmitting link 54.Clutch member 584 is mounted on a shaft 594 operatively connected to agear 596 which is in constant meshing engagement with a gear 598. Gear598 is mounted on a shaft 600 connected to totalizing counter 85. Withthe foregoing structure, it is clear that introduction of pressurizedfluid into chamber 572 shifts clutch member 584 into engagement withclutch member 586 for transmitting the motion imparted to link 54 torotate shaft 600 and thus actuate totalizing counter 85 in the samemanner as described in the embodiment of FIGURES 1-3.

Controlling fluid flow to motor 80 is a control valve 604 having a valvemember 606 shiftably disposed in a valve housing 608 and rigidlyconnected to a valve operating stem 610. Valve operating stem 610 isoperatively connected to shaft 594 such that displacement of clutchmember 584 shifts valve member 606 between two operating positions.Valve 604 is provided with two distinct operating ports 611 and 612, asupply port 613 connected to conduit 524 and an exhaust port 614.Operating port 611 is connected to cylinder 570 of motor 80 by means ofa conduit 616. Operating port 612 is connected to valve operatingchamber 546 of pilot valve 530 by means of a conduit 618.

When clutch member 584 is disengaged from clutch member 586, valvemember 606 is shifted to a position where fluid communication isestablished between exhaust port 616 and cylinder 570 to ventpressurized fluid acting on piston 66. In this position of valve 604,supply port 613 is connected to operating port 612 for supplyingpressurized fluid to valve operating chamber 546. When clutch member 584is engaged with clutch member 586, valve member 606 is shifted to aposition where supply port 613 is connected to operating port 611 forfurnishing pressurized fluid to cylinder 570. In this second position ofvalve 604, operating port 612 is connected to exhaust port 614 forventing fluid from valve operating chamber 546.

With continued reference to FIGURE 11, removal of fluid in metering tank3 is rapidly facilitated by applying pressure to the system through aconduit 630 which is connected to an inlet port 632 of a control valve634. Control valve 634 comprises a valve member 636 shiftably disposedin a housing 637 and rigidly connected to an operating stem 638extending beyond housing 636. Stem 638 is secured to a diaphragm 640 ofa valve operator 642 having an operating chamber 644 delimited bydiaphragm 640. In fluid communication with chamber 644 is a conduit 658which intersects conduit 540 between chamber 412 and valve 530. Valve634 is provided with a fluid operating port 648 which is connected bymeans of a conduit 650 to an operating port 672 of a pressure ejectionvalve 654 to be presently described in detail. Fluid communicationbetween operating ports 648 of valve 634 and top port 500 of meteringtank 3 is established by means of a conduit 656 which intersectsconduits 650 and 501.

Pressurized fluid for actuating valve 634 is furnished by a conduit 658which interconnects chamber 644 with conduit 540. Thus, when pressurizedfluid is furnished to actuate metering valve 400 to its position fordischarging the metered fluid from metering tank 3, pressurized fluid issimultaneously introduced into chamber 644 to open valve 634 byinterconnnecting port 632 with port 648. As a result, pressurized fluidis introduced into the system and is applied to the metered fluid intank 3 for ejecting the metered fluid through the bottom port 394 intank 3. When pressurized fluid is vented from valve operating chamber412, the fluid in chamber 644 is also vented to close valve 634 andthereby cut off the supply of pressurized fluid entering from conduit630.

Pressure ejection valve 654 is actuatable to vent pressure fluidadmitted by valve 634 after valve 634 is closed. Valve 654 comprises avalve member 660 shiftably disposed in a housing 662 and rigidlyconnected to an operating stem 664. Stem 664 is secured to a diaphragm666 of a valve operator 668 having a valve operating pressure fluidchamber 670 delimited by diaphragm 666. Valve member 660 is shiftablebetween open and closed position for respectively establishing andinterrupting fluid communication between an operating port 672 and adischarge port 674. Port 674 is connected to separator 390 by means of aconduit 676 which intersects conduit 498 between float chamber 496 andseparator 390. Port 672 is connected to conduit 650.

Valve operating chamber 670 is connected to operating port 451 ofshuttle valve 426 by means of a conduit 678. By supplying pressurizedfluid to chamber 67 0, valve member 660 is shifted to a position wherefluid communication is established between ports 672 and 674 for ventingthe pressurized fluid applied to the metered fluid in metering tank 3.When the pressure in chamber 670 is relieved, diaphragm 666, under aspring bias, is returned to a position where fluid communication betweenports 672 and 674 is interrupted. concomitantly with applying fluidpressure to chamber 670 to open valve 654 fluid pressure also is appliedto chamber 514 through a conduit 679 for opening valve 502.

Thus, valves 502 and 654 will close and open simultaneously. As aresult, venting of fluid to separator 390 is cut off when pressure isapplied through valve 634 to the metered fluid in metering tank 3 forremoving the metered fluid in metering tank 3 through the bottom port394, as will presently be described in further detail.

In operation of the system illustrated in FIGURES 4-1l, scale beam 200is initially calibrated to conform to oil well conditions. Inaccomplishing the calibration, the specific gravity of the water mixedwith the oil is determined. A poise 680 (FIGURE 5) slidably mounted onbeam bar 202 is shifted along a scale 682 to a position reading at thedetermined specific gravity of water. Poise 680 is locked in place bymeans of a set screw 684. After determining the specific gravity of theoil, trunnion 52 together with pivoted connector 162 is loosened andslid along a scale indicated at 686 to a position corresponding to thedifference between the specific gravity of the water and the specificgravity of the oil at the oil well from which the mixed liquid is to beremoved for measuring. Casing 372 is slid simultaneously with trunnion52 along rail 380 to maintain link 54 vertically plumb. In a finalpreliminary step, a poise 688 which is slidably mounted on beam bar 202to the left of poise 680 (as viewed from FIGURE 5) is shifted along ascale 690 on beam bar 202 to a position corresponding to the differencebetween the specific gravities of the oil and of the water and is lockedin this position by means of a set screw 692.

With scale beam 200 free to pivot about its fulcrum axis, the apparatusis prepared for measuring the fluid withdrawn from the oil well to whichit is connected. To start the operation, valve 458 is shifted to its onposition where fluid communication is established between operating port451 of shuttle valve 426 and valve operating chamber 414 of meteringvalve 400. Valve 526 is shifted to its position where it permits fluidflow through conduit 524, thus establishing fluid communication betweenoperating port 452 of shuttle valve 426 and supply port 613 of valve604.

Thus, with valves 458 and 526 in the positions illustrated in FIGURE 11and with pressurized gas applied to the system through conduits 453 and630, the system will now begin to operate automatically for measuringthe fluid withdrawn from the oil well to which the apparatus isconnected. This set up of component parts initiates the filling cycleduring which metering tank 3 is filled with the oil well fluid or otherapparatus from which fluid is taken for measuring.

With the initial filling cycle, no liquid is present in float chambers496 .and 422, thus lowering floats 494 and 462 respectively. By loweringfloat 494, valve 482 is actuated to vent any pressurized gas in valveoperating chamber 444 of shuttle valve 426. With float 462 lowered,valve 466 is positioned to admit pressurized gas to valve operatingchamber 448 thus shifting shuttle valve member 430 to the positionillustrated in FIGURE 11. As a result, pressurized gas is admitted tochamber 414 of valve operator 410 from operating port 452 of shuttlevalve 426 to shift valve member 402 to its position where fluidcommunication is established between separator 390 and the bottom port394 of metering tank 3 to admit oil well fluid from gas separator 390for metering. Simultaneously with application of pressurized gas tochamber 414 for actuating valve 400 to its position for filling meteringtank 3, pressurized gas is admitted to chamber 514 of valve operator 512for opening valve 502. By opening valve 502, fluid communication isestablished between the top of metering tank 3 and separator 390 forventing any gases accummulated in metering tank 3.

Introduction of oil well fluid into metering tank 3 will continue untilthe tank is filled and the fluid enters float chamber 496 through valve502. When sufficient fluid has entered chamber 496, float 494 is raisedto shift valve member 484 of valve 482 to a position where pressurizedgas is delivered to chamber 444 from conduit 468. Application of fluidpressure to diaphragm 436 of valve operator 440 shifts shuttle valvemember 430 downwardly as viewed from FIGURE 11 to a position where thefiuid pressure in chamber 514 of valve operator 512 is vented throughexhaust port 450 of shuttle valve 426. The relative pressures inchambers 444 and 448 may be regulated to facilitate this displacement ofshuttle valve member 430 by introduction of pressurized gas into chamber444. In addition, downward displacement of shuttle valve member 430vents pressurized gas from chamber 412 of valve operator 410. As aresult, seal valve 502 is shifted to its closed position and the valvemember 404 of metering valve 400 is shifted to its centered closedposition where admission or removal of oil well fluid from metering tank3 is precluded. With seal valve 502 and metering valve 400 closed, theliquid trapped in metering tank 3 and in the pipeline connectionsbetween valves 400 and 502 is a measured amount and may be convenientlyestablished to be one barrel or 42 gallons. Since the weight of oil wellfluid contained in this measured metering tank volume bears a directrelationship to the quantity of oil in the fluid, then the volume of theoil corrected to 60 F. is read out in the manner previously described inthe embodiment of FIGURES 1-3. Thus, a determinable portion of theweight is exerted on scale beam 200 which is calibrated to the densitiesof the oil and water components. As a result, a force proportional tothe oil content of the fluid is exerted at rack 592 through link 54 inthe manner previously explained. The rack displacement under the controlof the motion transmitting link 54 is transmitted to rotate dial 68through pinion 60.

As a result of shifting shuttle valve member 430 downwardly from theposition illustrated in FIGURE 11, pressurized gas from source 545 istransmitted through shuttle valve 426 and through pilot valve 530 toclutch chamber 572 for applying pressure to engage clutch member 584with clutch member 586. By engagement of clutch members 584 and 586,pinion 60 is coupled to the totalizing counter 85 in the mannerpreviously explained. When clutch members 584 and 586 are engaged, valve604 is actuated to a position where pressurized gas is applied throughvalve member 608 to the cylinder of motor 80 for displacing piston 566downwardly from the position illustrated in FIGURE 11.

Downward displacement of piston 566 displaces rack 592 downwardly in themanner explained in the embodiment of FIGURES 1-3 to drive the indicatordial 68 to zero and advance totalizing counter 85 by a like amount. Whendial 68 reaches zero as previously explained, valve 556 is tripped toconnect chamber 572 with exhaust port 580 for venting the pressurizedgas in chamber 572. As a result, clutch member 584 disengages fromclutch member 586 under the bias of a spring 700. By disengaging clutchmember 584 from clutch member 586, valve 604 is actuated to a positionwhere pressurized fluid is applied through valve member 606 to chamber542 of valve operator 540 for actuating valve 530. By disengaging clutchmember 584 from clutch member 586, valve member 606 is positioned tovent the pressurized fluid in the cylinder of motor 80 through exhaustport 614.

By venting the pressure in the cylinder of motor 80, piston 566 israised to shift valve member 560 of valve 566 to the positionillustrated in FIGURE 11 where valve 566 is set for subsequent fillingcycle. As piston 566 returns, counter 89 is actuated in the mannerdescribed in the embodiment of FIGURES 1-3.

As a result of disengaging clutch member 584 from clutch member 586,pressurized gas is supplied through valve 604 to valve operating chamber546 to shift valve member 532 of pilot valve 530 to a position wheresupply port 535 connects to operating port 538. Consequently,pressurized gas is delivered to chamber 412 of metering valve 400 toshift valve member 402 to a position where port 416 is connected withport 418, thus allowing oil well fluid in metering tank 3 to dischargethrough valve 400.

When pressurized gas is admitted to chamber 412, it is simultaneouslyadmitted to valve operating chamber 644 through conduit 646 for openingvalve 634. By opening valve 634, pressurized fluid is admitted from conduit 630 for applying a pressure to the surface of liquid in meteringtank 3 for forcing the liquid out through conduits 396 and 420.

The pressure admitted to the system through valve 634 is sealed from thevent conduit 498 and consequently from separator 390 by valve 654 andvalve 502 which are both in their closed positions as illustrated inFIGURE 11. Thus, with the opening of valve 634, fluid pressure isadmitted to forcibly and rapidly discharge the oil well fluid frommetering tank 3 through metering valve 400 and through float chamber 422to the oil treater or other process apparatus (not shown).

By filling float chamber 422, float 462 is raised to actuate valve 466for venting pressurized gas from chamber 448 of valve operator 442. Byventing pressurized gas from chamber 448 shuttle valve 426 is reset forthe next filling cycle. Due to the presence of pressure in valveoperating chamber 444, it is evident that shuttle valve member 430remains in its lowered position where valve operating chamber 414 isvented through exhaust port 450.

When metering tank 3 is emptied and float chamber 422 has drained, float462 drops to actuate valve 466 returning valve member 470 to theposition illustrated in FIGURE 11 where pressurized gas is againadmitted to chamber 448 to drive shuttle valve member 430 back to itsoriginal position illustrated in FIGURE 11. By shifting shuttle valvemember 430 to the position illustrated in FIGURE 11, pressure fluid invalve operating chambers 412 and 644 of valve 400 and 634 respectivelyare vented through ports 452 and 450 of shuttle valve 426. As a result,valve 634 will close.

By returning shuttle valve member 430 to its position shown in FIGURE11, pressurized gas is again applied to chambers 514 and 670 of valveoperators 512 and 668 respectively.

Admission of pressurized gas to chambers 514 and 670 causes valves 502and 654 to open simultaneously allowing the fluid trapped in floatchamber 496 and in conduit 501 upstream from valve 502 to drain backinto metering tank 3.

At the same time pressure fluid is admitted to valve operating chambers514 and 670, pressure fluid also is admitted to valve operating chamber414 of valve operator 410 to shift valve member 402 to a position wherefluid communication is again established between separator 390 and thebottom port 394 of metering tank 3. Thus, it will be appreciated thatoil well fluid drains into the top of metering tank 3 from the upperfloat chamber 496 concomitantly with the filling of metering tank 3 fromthe bottom. When float chamber 496 is completely drained, float 494drops to shift valve member 486 to the position illustrated in FIGURE 11where chamber 444 of valve operator 440 is vented through exhaust port490. In this manner the cycle of filling metering tank 3 and thendischarging the measured oil well fluid is automatically repeated.

FIGURE 12 illustrates a modified form of the system shown in FIGURE 11in which valve 502 is eliminated by locating valve 654 in conduit 498between float chamber 496 and separator 390. v

In this embodiment of FIGURE 12, the position of the lower float controlchamber 422 is changed to a location between metering valve 400 and thebottom port 394 of metering tank 3. As shown, conduit 420 is connectedto discharge port 416 of valve 400, and supply port 415 is connected toconduit 396. Float chamber 422 is connected to operating port 418 and toport 394 of metering tank 3 by conduit 396. The remaining arrangement ofcomponents in the system in FIGURE 12 is the same as that illustrated inFIGURE 11 and consequently further description is not required.

In operation of the system illustrated in FIGURE 12, the filling cycleis initiated when float 494 is lowered to actuate valve 482 to aposition where pressurized gas in the operating chamber 444 of shuttlevalve operator 440 is vented through port 490. After the precedingvolume of oil well fluid is completely discharged through metering valve400, float 462 will be lowered as a result of draining float chamber 422to actuate valve 466 to a position where pressurized gas is introducedinto operating chamber 448 of valve operator 442 for actuating shuttlevalve member 430 to the position illustrated in FIGURE 12. In thisposition, pressurized gas is supplied through operating port 451 ofshuttle valve 427 to operating chamber 414 of metering valve 400.

By introducing pressurized fluid into operating chamber 414, valvemember 402 is shifted to a position where supply port 415 is connectedto operating port 418 for establishing fluid communication betweenseparator 390 and metering tank 3. As a result, metering tank 3 isfilled with oil well fluid through its bottom port 394 in the 21 mannerpreviously described. When suflicient fluid has entered metering tank 3and conduit 501 and to fill float chamber 496 sufiiciently to raisefloat 494, valve 482 is actuated to a position where pressurized gas isintroduced into operating chamber 444 of shuttle valve operator 440.

While metering tank 3 is being filled, float 462 being below the levelof metering tank 3 will raise to actuate valve 466 to a position wherepressurized gas in operating chamber 448 of valve operator 442 is ventedthrough exhaust port 475. As a result, when suflicient fluid has enteredthe upper float control chamber 496 to cause valve member 484 of valve482 to be shifted to a position for admitting pressurized gas tooperating chamber 444, shuttle valve member 430 will be shifteddownwardly from the position illustrated in FIGURE 12 to connectedoperating port 451 with exhaust port 450 and also to connect operatingport 452 with supply port 449.

As a result of this actuation of shuttle valve member 430, meteringvalve 400 is closed, and the oil volume at standard temperature is readout in the manner previously described. Thereafter, metering valve 400is actuated in the manner previously described to shift valve member 402to a position where operating port 418 is connected to discharge port416 for discharging the oil well fluid in metering tank 3.

concomitantly with supplying pressurized gas to valve operating chamber412 of metering valve 400, pressurized gas is also supplied to valveoperating chamber 644 of valve operator 642 to open valve 634. Thisadmits pressurized fluid into the system as previously described toincrease the rate of discharge of oil well fluid contained in meteringtank 3. Also, at the same time that valve 634 is opened, pressurized gasis vented from valve operating chamber 670 of valve operator 668 toclose valve 654. As a result, the escape of pressurized fluid admittedby valve 634 is prevented, thus causing the pressurized fluid to act onthe surface of oil Well fluid in metering tank 3 and upper float controlchamber 496 to effectuate the rapid discharge of oil well fluid throughport 394.

While oil well fluid is being discharged from metering tank 3, lowerfloat control chamber 422 will remain filled to hold float 462 in itsraised position thus maintaining valve member 470 of value 466 in aposition where venting of valve operating chamber 448 continues. As soonas all of the oil well fluid in metering tank 3 has drained throughfloat control chamber 422 and into discharge line 420, float 462 will belowered sufficiently to actuate valve 466 to a position for once againadmitting pressurized gas to valve operating chamber 448. As a result,shuttle valve member 430 is shifted to the position illustrated in FIG-URE 12, thus resetting the system for another filling cycle in themanner previously described.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiments are therefore to be considered in all respects asillustrative and not restrictive, the scope of the invention beingindicated by the appended claims rather than by the foregoingdescription, and all changes which come within the meaning and range ofequivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by Letters Patent is:

1. A system for measuring the amount of one ingredient commingled withanother ingredient in a body of fluid comprising a weighing deviceoperably having a receptacle for receiving a predetermined volume ofsaid fluid, means on said weighing device connected to said receptaclefor transmitting a force proportional to the weight of said oneingredient, means for receiving said force and converting it into forceproportional to the amount of said one ingredient corrected to areference temperature, and register means operably connected with saidsystem for indicating said corrected amount of said ingredient.

2. The system as defined in claim 1, wherein said force receiving meanscomprises a fulcrumed resolver lever, automatic adjustment means on saidlever for automatically varying the lever ratio thereof, and temperaturesensing means responsive to the temperature of said fluid in saidreceptacle and operably connected to said automatic adjustment means forvarying said lever ratio in accordance with the temperature sensedthereby.

3. A process for measuring the amount of one ingredient commingled withat least another ingredient in a body of fluid comprising the steps offilling a constant volume receptacle with said fluid and weighing thereceptacle in comparison with a predetermined weight corresponding tothe Weight of said volume of another of said ingredients, converting theweight determination thus made into a force proportional to the amountof said one ingredient under standardized conditions, manifesting saidforce to indicate the amount of said ingredient present in said volume,and discharging said volume from the receptacle after the weightdetermination thereof is made.

4. In a system for measuring the amount of one ingredient commingledwith another ingredient in a body of fluid, a fulcrumed lever, means forproducing a force proportional to the volume of said one ingredient in apredetermined volume of said fluid 'and for applying said force to saidlever; a force take-off member mounted for longitudinal movement on saidlever and being operable to transmit said force applied to said lever,temperature compensating means responsive to the temperature of saidfluid in the predetermined volume of said fluid for varying theeffective lever arm length of said member to adjust said force to beproportional to the volume of said one ingredient at a predeterminedstand ard temperature, and means operatively connected to said memberand being responsive to the force transmitted thereby to manifest thevolume of said one ingredient at said standard temperature.

5. The system defined in claim 4, wherein said temperature compensatingmeans comprises a rod mounted for longitudinal movement on said leverand carrying said member, a motor unit operatively connected to said rodfor longitudinally dispacing said rod, and a controller provided withtemperature sensing means responsive to the temperature of said fluidand being operable to control the operation of said motor unit fordisplacing said rod in accordance with the temperature sensed by saidtemperature sensing means.

6. In an automatic system for measuring one ingredient commmgled with atleast another ingredient in a body of fluid being transported through aflow line, weighing means having a fluid receiving receptacle disposedin fluid communication With said flow line and being operable to developa force proportional to the amount of said one ingredient in apredetermined volume of said fluiddelivered to said receptacle, valvemeans disposed in said flow line and being operable to control thedelivery and d1scharge of said fluid with respect to said receptacle,and automatic means controlling said valve means to cyclically fill saidreceptacle from said flow line only with an amount of said fluidsubstantially equal to said predetermined volume and to discharge eachvolume to said flow line before the next volume is introduced.

7. The automatic system defined in claim 6, wherein said valve meanscomprises a single valve.

8. The automatic system defined in claim 6, wherein said valve meanscomprises a valve having a supply port connected to said flow lineupstream from said receptacle, a discharge port connected to said flowline downstream from said receptacle, 'an operating port in direct fluidcommunication with said receptacle, and a ported valve member under thecontrol of a valve operator to alternately connect said supply anddischarge ports with said operating port for respectively filling andemptying said receptacle.

9. The automatic system defined in claim 6, wherein said automatic meancomprises an upper float control means responsive to the level of fluidwith which said receptacle is filled to actuate said valve means formterrupting introduction of fluid into said receptacle when the volumeof fluid introduced into said receptacle reaches said predeterminedvolume and to initiate the discharge of fluid in said receptacle, andlower float control means disposed in said flow line and beingresponsive to the discharge of fluid from said receptacle to actuatesaid valve means for introducing fluid to said receptacle from theupstream side of said flow line only after said receptacle is emptied.

10. An apparatus for measuring the amount of an ingredient in a fluidflowing through a pipeline comprising spaced flow control valves in saidpipeline, a weighing device having a receptacle communicating with saidline between said valves, means for intermittently opening and closingsaid valves in response to the level of fluid in said device for fillingthe weighing device with successive slugs of said fluid and dischargingthe same from the device, said weighing device having a fulcrumed leverarm supporting said receptacle, counterweight means on said lever forbalancing said receptacle, a resolver lever means operably connected atone end to said lever arm, register means comprising two indicatorsoperatively connected to the other end of said resolver lever means,said register means adapted to indicate the amount of said ingredient insaid receptacle on an indicator in response to a force proportional tothe amount of said ingredient under standardized conditions transmittedfrom said resolver lever means, and to record the cumulative amount ofsaid ingredient in successive receptacle fillings on a second indicator.

11. A system for determining the amount of a certain ingredientsubstance in a combination of substances in a flow line comprising aweighing device, a temperature compensating lever mechanism, registermeans for recording the amount of said ingredient, and automatic controlmeans adapted to permit said system to determine the amount of saidingredient in a portion of said combination of substances, record saidamount, discharge said portion and receive another portion and repeatthe amount determining cycle; said weighing device comprising a counterbalanced lever having a receptacle in communication with said linemounted thereon; said temperature compensating mechanism comprising afulcrumed lever connected at one end to said counter balanced lever, arod mounted on said fulcrumed lever for longitudinal movement, said rodinterconnected with said fulcrumed lever at its other end to saidregister means, positioning means on said fulcrumed lever having atemperature sensing element in communication with said receptacleoperatively connected with said rod to shift the latter longitudinallyrelative to said fulcrumed lever in response to temperature variationsin the portion of said combination of substances in said receptacle;said register means comprising a rotatable shaft operatively connectedwith said rod by link means for rotating said shaft in response tomovements of said fulcrumed lever, a cumulative indicator on said shaft,and means for interconnecting said shaft and said indicator whenoperated in said cycle by said control means; said control meanscomprising a pressure source, switch means communicating with saidpressure source, and valve means for controlling flow in said lineoperably connected with said switch means for filling and dischargingsaid receptacle, pressure operated means in connection with saidpressure source for connecting said shaft and said indicator beforedischarge of said receptacle, and switch means also in fluidcommunication with said pressure source for effect ing discharge of saidreceptacle, disconnection of said rod and shaft, and resetting of saidsystem for measuring the amount of said substance in the next successiveportion of said combination of substances in said line.

12. In an automatic system for measuring the amount of one ingredientcommingled with another ingredient in a body of fluid, a weighing devicehaving a lever displaceable about a fulcrum axis with a fluid receivingreceptacle and a counterweight supported by said lever on opposite sidesof said fulcrum axis, means for feeding and discharging said rfluid withrespect to said receptacle in successive predetermined discrete volumesof uniform magnitude, said counterweight corresponding to the weight ofsaid predetermined volume of said other ingredient and cooperating withsaid lever to produce a force substantially proportional to the volumeof said one ingredient present in each of said discrete volumes inresponse to the presence of said one ingredient in the fluid admitted tosaid receptacle, and means responsive to said force for manifesting thevolume of said one ingredient present in each of said discrete volumes.

13. In a system for measuring the amount of one ingredient commingledwith at least another ingredient in a body of fluid, a weighingmechanism having a counterweighted unitary scale beam displaceable abouta fulcrum axis, a fluid receiving receptacle supported by said scalebeam with said scale beam being operable to manifest the volume of saidone ingredient present in a predetermined volume of said fluidintroduced into said receptacle, and weighted means mounted forlongitudinal movement on said scale beam; and temperature compensatingmeans operable in response to the temperature of said fluid forlongitudinally moving said weighted means to a position relative to saidfulcrum axis for resolving the movement of said scale beam to manifestthe volume of said one ingredient at a predetermined standardtemperature.

14. A portable weighing mechanism comprising a support, a scale beampivotally mounted in one position on said support for displacement abouta fulcrum axis, a fluid receiving receptacle and counterweight meanssupported by said scale beam at opposite sides of said fulcrum axis,manually operable means for bodily displacing said scale beam from saidone position to a second position where said scale beam is seated onsaid support and restrained against pivotal displacement, means securingsaid scale beam against movement in said second position, and means onsaid support for separately seating said receptacle and saidcounterweight independently of said scale beam when said scale beam isin said second position to relieve the scale beam of the loads of saidreceptacle and counterweight.

15. The portable Weighing mechanism defined in claim 14 wherein saidmanually operable means comprises at least one threaded screw memberthreadedly mounted on said support means and carrying hanger means fromwhich said scale beam is suspended, said scale beam being bodilydisplaceable between said first and second position by advancement ofsaid screw member.

16. A portable weighing mechanism comprising a rigid support, a scalebeam with load receiving means and a counter weight suspended therefrom,knife-edged pivot means carried by said scale beam for swinging saidscale beam about a fulcrum axis, manipulatable means mounted on saidsupport for selectively raising and lowering said scale beam with saidscale beam being arranged to nonpivotally seat on said support in alowered position, pivot seats carried by said manipulatable means andengageable with said knife-edged means for lifting said scale beam fromits seated position and for pivotally supporting said scale beam aboutsaid fulcrum axis, and manipulatable means being operable to move saidpivot seats out of engagement with said knife-edged means when saidscale beam is seated on said support, and means for securing said scalebeam against movement in its seated position on said support.

17. The portable weighing mechanism defined in claim 16, wherein saidscale beam comprises a pair of spaced apart beam bars rigidly joinedtogether by spaced transversely extending cross pieces disposed one oneach side

1. A SYSTEM FOR MEASURING THE AMOUNT OF ONE INGREDIENT COMMINGLED WITHANOTHER INGREDIENT IN A BODY OF FLUID COMPRISING A WEIGHING DEVICEOPERABLY HAVING A RECEPTACLE FOR RECEIVING A PREDETERMINED VOLUME OFSAID FLUID, MEANS ON SAID WEIGHING DEVICE CONNECTED TO SAID RECEPTACLEFOR TRANSMITTING A FORCE PROPORTIONAL TO THE WEIGHT OF SAID ONEINGREDIENT, MEANS FOR RECEIVING SAID FORCE AND CONVERTING IT INTO FORCEPROPORTIONAL TO THE AMOUNT OF SAID ONE INGREDIENT CORRECTED TO AREFERENCE TEMPERATURE, AND REGISTER